I'm looking at the Wiki entries for this stuff, and from the examples given, it really, really comes off as people upset that they're not getting on-screen Yaoi to me.It's easy to push queerbaiting aside like it's nonsense when you've never had to experience it. Must be nice to watch TV and not have to worry about anything.
Clarke/Lexa also would fall more into just a bait and switch in general, given that the issue wasn't them being afraid to show intimacy on-screen.